Add `call_num` key/value to the `Call JSON` object.#1118

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gofaster:add_mqtt_audio_key

Commits on Apr 5, 2026

Add `call_num` key/value to the `Call JSON` object. As the MQTT `call_start` and `call_end` messages contain the `call_num` key/value, this helps consumers match call events with audio.
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